Abstract: A method for starting a photovoltaic rapid shutdown system, an application apparatus and a system are provided. In this method, the inverter system controls a voltage of a direct current bus in the photovoltaic rapid shutdown system. The photovoltaic module breaker makes determination based on a detected output voltage of the photovoltaic module breaker. In a case that the change characteristics of the voltage of the direct current bus connected to the photovoltaic module breaker meets the predetermined turn-on condition, the photovoltaic module breaker controls itself to be turned on. Therefore, the photovoltaic module breaker can determine whether the photovoltaic module breaker receives a turn-on signal only based on its own voltage acquisition device without an additional receiving apparatus.

Abstract: A HiL testing platform for a photovoltaic power station and a PPC performance testing method are provided. The HiL testing platform includes: a PPC, an inverter controller, and a HiL real-time simulator. Each of the PPC, the inverter controller, and the HiL real-time simulator is arranged with an upper computer. The PPC is configured to communicate with the inverter controller according to a predetermined communication protocol. The HiL real-time simulator is connected to the PPC and the inverter controller through a digital input interface and/or an analog output interface, and is configured to simulate a testing device in the photovoltaic power station in a digital model form.

Abstract: A method and a device for primary frequency modulation in new energy power generation are provided. An inverter performs a first power adjustment according to a p-f droop curve before receiving a power adjustment instruction sent by the power station controller, and performs a second power adjustment in response to the power adjustment instruction. Since the inverter performs the first power adjustment before responding to the power adjustment instruction sent by the power station controller, the response of the primary frequency modulation is speeded up, so that rapid control for the new energy generation power is achieved, thereby ensuring stable operation of a power grid for new energy power generation.

Abstract: A connector for combining cabinets includes a flexible connector which is deformable and is configured to communicate inner cavities of a first cabinet machine and a second cabinet machine. The flexible connector includes a hollow cavity for an electrical connector to pass through, and the hollow cavity forms a first open end and a second open end at two ends of the flexible connector. The first open end is sealingly connected to a side plate of the first cabinet machine, the second open end is sealingly connected to a side plate of the second cabinet machine, and the first cabinet machine and the second cabinet machine are two adjacent cabinet machines. The structure of the connector for combining cabinets is simple and the mounting is convenient, and the flexible connector can automatically adapt to the mounting position through its own deformation so as to meet the normal mounting requirements.

Abstract: An energy storage system and a thermal management method therefor are provided. The method is performed by a smart battery thermal management unit in the energy storage system. In the method, a charging-discharging current in a next preset time period, a current parameter of a battery cell, a predicted ambient temperature in the next preset time period, and a refrigerant returning temperature are acquired. A heat dissipation strategy with minimum total power consumption in the next preset time period is determined based on the charging-discharging current, the current parameter of the battery cell, the predicted ambient temperature, the refrigerant returning temperature and power consumption of the cooling system. The cooling system is controlled based on the heat dissipation strategy with minimum total power consumption, to cool the energy storage system.

Abstract: A photovoltaic grid-connected system and a control method therefor. The photovoltaic inverter is connected to the grid through a synchronous motor back-to-back drive system including two synchronous motors. The photovoltaic inverter is controlled to operate in the current source mode after the photovoltaic grid-connected system is started, the synchronous motor back-to-back drive system is controlled to operate in the generator mode, and the excitation current of the first synchronous motor is controlled to maintain the voltage stability of the AC side of the photovoltaic inverter. Therefore, the stability and safety of the power grid is significantly improved and the impact of intermittent new energy on the power grid is reduced by virtue of the characteristics of the synchronous motor, and the maximum power point of the photovoltaic array can be tracked to avoid loss of power generation, and traditional photovoltaic inverters can be used without any modification.

Abstract: A method and a device for detecting coverage in HIL testing, and a computer-readable storage medium are. The method includes: acquiring an HIL test case and performing HIL testing on a controller based on the HIL test case; for each of functions in code of the controller, detecting a preset mark of the function and acquiring statistical data about the detected preset mark during the HIL testing; and determining coverage of the HIL test case on the functions based on the statistical data about the preset marks. Both the determination of execution and functionality of the function in the code based on the HIL test case as well as the determination of the coverage of the HIL test case based on the execution of the function in the code are performed during the HIL testing.

Abstract: A performance testing device for heat pipe heatsink is provided according to the present application, including a heating simulation assembly, first temperature sensors and second temperature sensors, the heating simulation assembly is used to simulate heating generation of a heating element and has a heat conduction end face fitted to and transfer heat with the evaporation pipe sections of heat pipes of the heat pipe heatsink; the first temperature sensors are used to detect the temperature of the heat conduction end face, and the first temperature sensors are arranged in one-to-one correspondence with the evaporation pipe sections of the heat pipes; the second temperature sensors are arranged at condensing pipe sections of the heat pipes.

Abstract: A method for controlling a photovoltaic rapid shutdown system, an inverting system, and a photovoltaic rapid shutdown system. In the photovoltaic rapid shutdown system, the inverting system determines whether the photovoltaic rapid shutdown system is to enter a safe mode, introduces fluctuations onto a direct-current bus in the photovoltaic rapid shutdown system in response to the photovoltaic rapid shutdown system being not to enter the safe mode, and otherwise does not introduce the fluctuations onto the direct-current bus. A shutdown device for a photovoltaic module determines according to an output parameter thereof whether an electrical parameter on the direct-current bus connected to the shutdown device meets a preset condition, controls itself to be turned on or maintains itself being on in response to the electrical parameter meeting the preset condition, and otherwise controls itself to be turned off or maintains itself being off.

Abstract: A flowguide grille, an air conditioner and an energy storage device are disclosed according to the present disclosure, the flowguide grille comprises a mounting bracket and a plurality of guide vanes, the mounting bracket is mounted on the air conditioner and covers an air outlet of the air conditioner, the mounting bracket is extended along an up-down direction of the air conditioner; the plurality of guide vanes are connected to the mounting bracket at intervals, the guide vane comprises a drainage plate and a guide plate, the drainage plate is extended along an air outlet direction of the air conditioner, and is bent upwards to be connected with the guide plate, the guide vanes are used for expanding the air outlet range of the air conditioner in the up-down direction.

Abstract: A power conversion device and an integrated machine are provided, The power conversion device includes a housing and a power converter. The power converter is arranged in the housing, and two ends, opposite to each other, of the power converter are respectively provided with a direct current wiring area and an alternate current wiring area. Two ends of the housing corresponding to the direct current wiring area and the alternate current wiring area each is provided with a movable door being capable of being opened and closed.

Abstract: A fairing and a fan device are provided according to the present disclosure. The fairing includes a fairing body which is arranged at a fan air vent, the fairing body has a fairing area, which is annular and is located at a periphery of a geometric center of the fairing body, and the fairing area is provided with a fairing through hole. In the fairing according to the present disclosure, the fairing body has the fairing area, the fairing area is provided with the fairing through hole, and the fairing body is configured to arranged at the fan air vent, so that the airflow is faired through the fairing through hole, the fairing area is annular and is located at the periphery of the geometric center of the fairing body, so that the fairing body has no fairing through hole at its geometric center.

Abstract: An inverter is provided according to the present disclosure. The inverter is configured with a first direction and a second direction, the first direction and the second direction are vertical to each other, and a length of the inverter in the first direction is greater than a length of the inverter in the second direction; the inverter comprises a direct current device and an inversion alternating current device, and the direct current device and the inversion alternating current device are arranged along the first direction and electrically connected; wherein the direct current device and the inversion alternating current device are arranged alternately; or the inversion alternating current device is arranged collectively and the direct current device is arranged on an outside of the alternating current device.

Abstract: The present disclosure provides an electrical device using a cooling device, which includes a first box, a second box arranged on one side of the first box, and a power device arranged inside the first box. The cooling device is arranged inside the second box, and the cooling device includes a substrate evaporator, a first condenser and a pipe. The cooling device is configured to collect the heat inside the first box to the second box, that is, the substrate evaporator directly absorbs the heat generated by the high-power devices inside the first box. Moreover, the spoiler fan arranged inside the first box can disturb the air inside the first box, so that the spoiler fan and the first box evaporator cooperate to exchange heat in the air inside the first box.

Abstract: An inverter circuit control method and a device thereof are provided. In the control method, after determining a DC bus voltage and an output leakage current of a target inverter circuit, a modulation harmonic wave to be injected into a SPWM signal is adjusted according to the DC bus voltage or the output leakage current if it is determined according to the DC bus voltage that the target inverter circuit satisfies a preset modulation condition, such that total harmonic distortion of a current of the target inverter circuit is within a preset range. The DC bus voltage and the output leakage current of the target inverter circuit are used as references for adjusting the modulation harmonic wave, ensuring total harmonic distortion of the current of the target inverter circuit to be within a preset range.

Abstract: A cascaded power electronic transformer and a method for controlling the same are provided. The method includes: calculating electrical angles ?i1 and ?kps of an sth transformer and a compensation electrical angle ?j of a jth transformer; adding the compensation electrical angle ?j to the electrical angle ?kps of the jth transformer, to obtain a compensated electrical angle ?kps of the jth transformer; and calculating a square wave of a bridge arm voltage of each of the m primary converters and the r secondary converters of the sth transformer based on the electrical angle ?i1 and the electrical angle ?kps of the sth transformer after compensation.

Abstract: A photovoltaic inverter, a photovoltaic system, and a method for controlling discharging are provided. The photovoltaic inverter includes a first DCDC converter, an inverter circuit, a first discharging circuit, and a controller. A port capacitor is connected between a positive input end and a negative input end of the first DCDC converter. The port capacitor includes an X capacitor and a first group of Y capacitors. The first discharging circuit is connected between a common terminal of the first group of Y capacitors and a direct current bus, where the common terminal of the first group of Y capacitors is grounded. The controller is configured to control, when receiving a rapid shutdown instruction, the first discharging circuit to operate. The first discharging circuit is configured to discharge electrical energy of the port capacitor.

Abstract: The Disclosed in the present application are a power electronic device on a direct-current side of a photovoltaic system, and a test system and a control method therefor, achieving a simple, fast, and low-cost functional test on the power electronic device during a production process or a troubleshooting process of the power electronic device on the direct-current side of the photovoltaic system. The power electronic device is used for detecting a fluctuation of an electric signal parameter of an input end of the power electronic device; when the fluctuation meets a preset condition, the device is switched from a limited output state to a non-limited output state; the fluctuation of the electric signal parameter of the input end is generated by applying a disturbance to the input end of the power electronic device on the direct-current side of the photovoltaic system by a direct-current power supply having a disturbance output.

Abstract: A noise reduction assembly includes an outer frame and a partition plate. An accommodating cavity is arranged in the outer frame; the partition plate is arranged in the accommodating cavity, and the partition plate and the outer frame form a noise reduction channel, the noise reduction channel includes a first noise reduction section, a second noise reduction section and a third noise reduction section that are communicated in sequence, and the channel cross-sectional areas of the first noise reduction section and the third noise reduction section are both smaller than the channel cross-sectional area of the second noise reduction section. The technical solution of the present application may reduce the noise of a new energy equipment having the noise reduction assembly during operation.